It's a formless grey blob, it's weak and harmless but it always leaves a mess and people and pokemon alike consider it a nuisance. It thinks rather highly of itself.
Abilities: Stall - always moves last.
Hidden Ability: Slow Start - Temporarily halves Attack and Speed.
Stat spread is 40/40/40/40/40/255
Moves Bide Copycat Encore Facade Focus Energy Last Resort Mean Look Poison Gas Psych Up Recycle Roar Self-Destruct Slack Off Spit Up Splash Stockpile Swagger Taunt Torment Toxic Uproar Venom Drench Work Up Yawn
So, here's what I'm thinking. It's a slimy sort of pokemon, slowly accretes its way up hills and the like. It doesn't have a brain as we understand it, though. It's a bit like Muk but with less form and not so 3D. And it never smiles, either. It's too dour and sad for that.